can someone provide any comments on greylisting?
how effective is it, etc?
thanks,
we have 20 regex expressions that block mail directly from a
reverse dns that "looks" like a consumer broadband connection.
Then we have to maintain a whitelist on a case by case basis.
The reduction in unwanted email is on the order of 40 or 50
to 1. It obviously is not without its own pain so it may
not be for you. This should discussion should probably be
taken offline or two another list though.
Ken Leland
Monmouth Internet
Ken Leland [2/7/2004 2:11 AM] :
can someone provide any comments on greylisting?
how effective is it, etc?we have 20 regex expressions that block mail directly from a reverse dns that "looks" like a consumer broadband connection. Then we have to maintain a whitelist on a case by case basis.
Er, I think you and Dmitri are talking about different things.
From a mail operations standpoint, I am not a big fan of graylisting, because even legitimate senders get 4xx'd for a while, the first time they send mail.
When any such strategy means that someone else's mail queues are filled with timed out emails waiting for retransmission, it d not be rocket science to see why this just doesn't scale too well.
well, it might not scale only at the global scale 
(while its current 'deployment' is far from being global
as far as i can see)